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1.
0 degree celsius.
Water turns into ice at 0 degree celsius or at 32° Fahrenheit under standard conditions of atmospheric pressure.
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The earth is protected from certain rays of the sun by a layer in the upper atmosphere called ozone.
A growing hole in the ozone layer was spotted over the Antartica, and there is a lot of concern over possible damage to the ozone layer caused by various chemicals.
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3.Daniel Gabriel Fahrenheit (1686-1736) was the first (years before Celsius) to introduce a scale designed to measure temperatures. This German physicist developped the use of mercury in thermometers. To convert Fahrenheit degrees into Celsius degrees, take away 32 and multiply by 5/9. Ex. : 50 °F = 50 - 32 = 18 : 9 = 2 x 5 = 10 °C. On the Fahrenheit scale, water freezes at 32°(0°on the Celsius scale), and boils at 212° (100°on the Celsius scale) under standard conditions of atmospheric pressure.
Nitric acid, a very dangerous substance, is used for testing the quality of gold.
5. Nanotechnology
(This answer was provided by Hugh Clay Paulk from Knowledge News.)
Nanotechnology is the manipulation of matter at the atomic or molecular level to create novel structures, like carbon molecules arranged in nanotubes, which are 100 times as strong as steel but far lighter. And while it's all about being little, nanotechnology may be the next big thing to come out of science fiction.
Nanotech takes its name from the word "nanometer," which is just one-billionth of a meter. How small is that? Small. Almost inconceivably small. A strand of your hair is about
80,000 nanometers wide. The DNA inside your cells is about two nanometers wide. A nasty virus might span a hundred. In fact, one nanometer is just about the length of 10 hydrogen atoms strung together.Already nanoparticles make your tennis racquet stronger, your pants more stain-resistant, and your hard drive store more data. Proponents describe a future in which nanotechnology will lead to wonders, such as minute diagnostic systems that can
detect cancers when they are no more than a few cells in size or data-storage systems that could house the Library of Congress in something the size of a sugar cube.~ Hugh Clay Paulk
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